How can i solve this java lang error?

Question

I am trying to solve this java lang error:

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.sebasdeldihotmail.mediocre11/com.sebasdeldihotmail.mediocre11.SignUpOrLogInActivity}: java.lang.ClassCastException: com.sebasdeldihotmail.mediocre11.SignUpOrLogInActivity cannot be cast to android.app.Activity
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2039)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2153)
        at android.app.ActivityThread.access$700(ActivityThread.java:137)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:5031)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
        at dalvik.system.NativeStart.main(Native Method)
 Caused by: java.lang.ClassCastException: com.sebasdeldihotmail.mediocre11.SignUpOrLogInActivity cannot be cast to android.app.Activity
        at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2030)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2153)
            at android.app.ActivityThread.access$700(ActivityThread.java:137)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5031)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
            at dalvik.system.NativeStart.main(Native Method)

i have checked again and again the code and i can't find what is making the app crash, maybe some fresh eyes can help to find the issue.

Here is the SignUpOrSignIn class

public class SignUpOrLogInActivity extends Fragment {

    private static final String TAG = "MainFragment";
    Button signIn;
    Button signUp;    

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View root = inflater.inflate(R.layout.signinorsignup_activity,container,false);   

        Button signIn = (Button)root.findViewById(R.id.login);
        signIn.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                startActivity(new Intent(getActivity(), LoginActivity.class));
            }
        });

        Button signUp = (Button)root.findViewById(R.id.signup);
        signUp.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                startActivity(new Intent(getActivity(),SignUpActivity.class));
            }
        });
        return root;
    }

    private void onSessionStateChange(Session session, Session state, Exception exception) {
        if (state.isOpened()) {
            Log.i(TAG, "Logged in...");
        } else if (state.isClosed()) {
            Log.i(TAG, "Logged out...");
        }
    }
}

and here is the layout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#67AAE4">

    <Button
        android:id="@+id/signup"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Sign Up"/>

    <Button
        android:id="@+id/login"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Login"/>


    <com.facebook.widget.LoginButton
        android:id="@+id/authButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="30dp"
        />

</LinearLayout>

MANIFEST

<uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application

        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme"
        android:name=".ParseStarter">
        <activity
            android:screenOrientation="portrait"
            android:name=".MainActivity"
            android:label="@string/app_name" >

        </activity>

        <activity android:name=".SignUpOrLogInActivity"

            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity >


        <activity android:name=".DispatchActivity"/>
        <activity android:name=".LoginActivity" />
        <activity android:name=".SignUpActivity" />
        <activity android:name="com.facebook.LoginActivity"/>


        <meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/facebook_app_id"/>


    </application>

</manifest>

"CORRECTED MANIFEST"

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.sebasdeldihotmail.mediocre11" >


    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application

        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme"
        android:name=".ParseStarter">
        <activity
            android:screenOrientation="portrait"
            android:name=".MainActivity"
            android:label="@string/app_name" >




            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity >


        <activity android:name=".DispatchActivity"/>
        <activity android:name=".LoginActivity" />
        <activity android:name=".SignUpActivity" />
        <activity android:name="com.facebook.LoginActivity"/>


        <meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/facebook_app_id"/>


    </application>

</manifest>

Can anyone figure out what is making the app crash?

Thanks very much for reading :)

Answer 1

Your SignUpOrLogInActivity extends Fragment. I'm assuming, based on the name, that this class is declared in the manifest as an Activity, which makes Android expect it to be a sub-class of Activity.

A Fragment must be contained in an Activity, so you need to create a class that extends Activity and contains your Fragment (which I would rename to something that doesn't contain the word Activity, since it's confusing). Your Android manifest should declare that activity class as the activity from which your app is launched.

Answer 2

 SignUpOrLogInActivity extends Fragment 

this is a fragment, and you are casting it to an activity.

You need to typecast it to a fragment for it to work

Caused by: java.lang.ClassCastException: com.sebasdeldihotmail.mediocre11.SignUpOrLogInActivity cannot be cast to android.app.Activity